Free tools
All my free tools
Cheat sheets, blueprints and routines you can use right away. No sign-up needed. New ones are added regularly.
Cheat sheetCO₂ Table Cheat Sheetgertleroy.com/co2-table-cheat-sheet
Three CO₂ tables with timings, progressions and safety rules. Pick your starting point.
Open the free tool →BlueprintBreath-Hold Blueprintgertleroy.com/breathhold-blueprint
The five stages of a breath-hold, plus a guided hold to follow with Gert.
Open the free tool →RoutineApnea Walkinggertleroy.com/apnea-walking
Coming soon
Train CO₂ tolerance on a walk you already take.
Preview →Want the full program?
Train with me in Breathe with Gert
Start with the 6-Week Breathwork Challenge. 15 min a day, from home. No water needed.
2:100:50 → 2:10 · 26d
3:321:30 → 3:32 · 45d
5:042:45 → 5:04 · 62d